16161605 has 4 divisors (see below), whose sum is σ = 19393932. Its totient is φ = 12929280.

The previous prime is 16161589. The next prime is 16161623. The reversal of 16161605 is 50616161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4553956 + 11607649 = 2134^2 + 3407^2 .

It is not a de Polignac number, because 16161605 - 2⁴ = 16161589 is a prime.

It is a super-2 number, since 2×16161605² = 522394952352050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616156 + ... + 1616165.

It is an arithmetic number, because the mean of its divisors is an integer number (4848483).

Almost surely, 2^16161605 is an apocalyptic number.

It is an amenable number.

16161605 is a deficient number, since it is larger than the sum of its proper divisors (3232327).

16161605 is an equidigital number, since it uses as much as digits as its factorization.

16161605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232326.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16161605 is about 4020.1498728281. The cubic root of 16161605 is about 252.8297427101.

Adding to 16161605 its reverse (50616161), we get a palindrome (66777766).

The spelling of 16161605 in words is "sixteen million, one hundred sixty-one thousand, six hundred five".